MC74LCX257
Low-Voltage CMOS Quad
2-Input Multiplexer
With 5.0 V–Tolerant Inputs and Outputs
(3–State, Non–Inverting)
http://onsemi.com
The MC74LCX257 is a high performance, quad 2–input
multiplexer with 3–state outputs operating from a 2.3 to 3.6 V supply.
High impedance TTL compatible inputs significantly reduce current
loading to input drivers while TTL compatible outputs offer improved
switching noise performance. A V
I
specification of 5.5 V allows
MC74LCX257 inputs to be safely driven from 5.0 V devices.
Four bits of data from two sources can be selected using the Select
input. The four outputs present the selected data in the true
(non–inverted) form. The outputs may be switched to a high
impedance state by placing a logic HIGH on the Output Enable (OE)
input. Current drive capability is 24 mA at the outputs.
MARKING
DIAGRAMS
20
20
LCX257
1
SO–20
DW SUFFIX
CASE 751D
1
20
20
1
TSSOP–20
DT SUFFIX
CASE 948E
1
LCX
257
ALYW
AWLYYWW
•
•
•
•
•
•
•
•
Designed for 2.3 to 3.6 V V
CC
Operation
5.0 V Tolerant – Interface Capability with 5.0 V TTL Logic
Supports Live Insertion and Withdrawal
I
OFF
Specification Guarantees High Impedance When V
CC
= 0 V
LVTTL Compatible
LVCMOS Compatible
24 mA Balanced Output Sink and Source Capability
Near Zero Static Supply Current in All Three Logic States (10
µA)
Substantially Reduces System Power Requirements
•
Latchup Performance Exceeds 500 mA
•
ESD Performance: Human Body Model >2000 V;
Machine Model >200 V
20
20
1
SO EIAJ–20
M SUFFIX
CASE 967
A
L , WL
Y, YY
W, WW
1
74LCX257
AWLYWW
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
MC74LCX257DW
MC74LCX257DWR2
MC74LCX257DT
MC74LCX257DTEL
MC74LCX257DTR2
MC74LCX257M
MC74LCX257MEL
Package
SO–20
SO–20
TSSOP–20
TSSOP–20
TSSOP–20
SO
EIAJ–20
SO
EIAJ–20
Shipping
38 Units/Rail
1000 Units/Reel
75 Units/Rail
2000 Units/Reel
2500 Units/Reel
40 Units/Rail
2000 Units/Reel
©
Semiconductor Components Industries, LLC, 2000
1
December, 2000 – Rev. 1
Publication Order Number:
MC74LCX257/D
MC74LCX257
V
CC
16
OE
15
I0c
14
I1c
13
Zc
12
I0d
11
I1d
10
Zd
9
I0a
I1a
I0b
I1b
1
S
2
I0a
3
I1a
4
Za
5
I0b
6
I1b
7
Zb
8
GND
I0c
I1c
I0d
I1d
2
3
5
6
14
13
11
10
4
Za
7
Zb
12
Zc
Figure 1. Pinout: 16–Lead Plastic Package
(Top View)
9
Zd
PIN NAMES
Pins
I0n
I1n
OE
S
Zn
Function
Source 0 Data Inputs
Source 1 Data Inputs
Output Enable Input
Select Input
Outputs
OE
15
S
1
Figure 2. Logic Diagram
TRUTH TABLE
Inputs
OE
H
L
L
L
L
S
X
H
H
L
L
I0n
X
X
X
L
H
I1n
X
L
H
X
X
Outputs
Zn
Z
L
H
L
H
H = High Voltage Level
L = Low Voltage Level
X = High or Low Voltage Level
Z = High Impedance State
For I
CC
Reasons, DO NOT FLOAT Inputs
http://onsemi.com
2
MC74LCX257
ABSOLUTE MAXIMUM RATINGS*
Symbol
V
CC
V
I
V
O
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
Value
–0.5 to +7.0
–0.5
≤
V
I
≤
+7.0
–0.5
≤
V
O
≤
+7.0
–0.5
≤
V
O
≤
V
CC
+ 0.5
I
IK
I
OK
DC Input Diode Current
DC Output Diode Current
–50
–50
+50
I
O
I
CC
I
GND
T
STG
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
±50
±100
±100
–65 to +150
Output in 3–State
Output in HIGH or LOW State (Note 1.)
V
I
< GND
V
O
< GND
V
O
> V
CC
Condition
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
°C
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is
not implied.
1. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
I
OH
Supply Voltage
Input Voltage
Output Voltage
HIGH Level Output Current
(HIGH or LOW State)
(3–State)
V
CC
= 3.0 V – 3.6 V
V
CC
= 2.7 V – 3.0 V
V
CC
= 2.3 V – 2.7 V
V
CC
= 3.0 V – 3.6 V
V
CC
= 2.7 V – 3.0 V
V
CC
= 2.3 V – 2.7 V
–40
0
Parameter
Operating
Data Retention Only
Min
2.0
1.5
0
0
0
Typ
3.3
3.3
Max
3.6
3.6
5.5
V
CC
5.5
– 24
– 12
– 8.0
+ 24
+ 12
+ 8.0
+85
10
Unit
V
V
V
mA
I
OL
LOW Level Output Current
mA
T
A
∆t/∆V
Operating Free–Air Temperature
Input Transition Rise or Fall Rate, V
IN
from 0.8 V to 2.0 V,
V
CC
= 3.0V
°C
ns/V
http://onsemi.com
3
MC74LCX257
DC ELECTRICAL CHARACTERISTICS
T
A
= –40°C to +85°C
Symbol
V
IH
Characteristic
HIGH Level Input Voltage (
g (Note 2.)
)
Condition
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
V
IL
LOW Level Input Voltage (Note 2.)
g (
)
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
V
OH
HIGH Level Output Voltage
g
2.3 V
≤
V
CC
≤
3.6 V; I
OL
= 100
µA
V
CC
= 2.3 V; I
OH
= –8.0 mA
V
CC
= 2.7 V; I
OH
= –12 mA
V
CC
= 3.0 V; I
OH
= –18 mA
V
CC
= 3.0 V; I
OH
= –24 mA
V
OL
LOW Level Output Voltage
g
2.3 V
≤
V
CC
≤
3.6 V; I
OL
= 100
µA
V
CC
= 2.3 V; I
OL
= 8.0 mA
V
CC
= 2.7 V; I
OL
= 12 mA
V
CC
= 3.0 V; I
OL
= 16 mA
V
CC
= 3.0 V; I
OL
= 24 mA
I
I
I
OZ
I
OFF
I
CC
∆I
CC
Input Leakage Current
3–State Output Current
Power–Off Leakage Current
Quiescent Supply Current
y
2.3 V
≤
V
CC
≤
3.6 V; 0 V
≤
V
I
≤
5.5 V
2.3
≤
V
CC
≤
3.6 V; 0V
≤
V
O
≤
5.5 V;
V
I
= V
IH
or V
IL
V
CC
= 0 V; V
I
or V
O
= 5.5 V
2.3
≤
V
CC
≤
3.6 V; V
I
= GND or V
CC
2.3
≤
V
CC
≤
3.6 V; 3.6
≤
V
I
or V
O
≤
5.5 V
Increase in I
CC
per Input
2.3
≤
V
CC
≤
3.6 V; V
IH
= V
CC
– 0.6 V
V
CC
– 0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
±5.0
10
10
±10
500
µA
µA
µA
µA
µ
µA
V
Min
1.7
2.0
0.7
0.8
V
V
Max
Unit
V
2. These values of V
I
are used to test DC electrical characteristics only.
AC CHARACTERISTICS
(t
R
= t
F
= 2.5 ns; R
L
= 500
Ω)
Limits
T
A
= –40°C to +85°C
V
CC
= 3.3 V
±
0.3 V
C
L
= 50 pF
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
In to Zn
Propagation Delay
S to Zn
Output Enable Time to
High and Low Level
Output Disable Time From
High and Low Level
Output–to–Output Skew
(Note 3.)
Waveform
1
1,2
3
3
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
6.0
6.0
7.0
7.0
7.0
7.0
5.5
5.5
1.0
1.0
V
CC
= 2.7 V
C
L
= 50 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
6.5
6.5
8.5
8.5
8.5
8.5
6.0
6.0
V
CC
= 2.5 V
±
0.2 V
C
L
= 30 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max
7.2
7.2
9.1
9.1
9.1
9.1
6.6
6.6
ns
ns
ns
ns
ns
Unit
3. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGH–to–LOW (t
OSHL
) or LOW–to–HIGH (t
OSLH
); parameter
guaranteed by design.
http://onsemi.com
4
MC74LCX257
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25°C
Symbol
V
OLP
V
OLV
Characteristic
Dynamic LOW Peak Voltage
(Note 4.)
Dynamic LOW Valley Voltage
(Note 4.)
Condition
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= 2.5 V, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
V
CC
= 2.5 V, C
L
= 30 pF, V
IH
= 2.5 V, V
IL
= 0 V
Min
Typ
0.8
0.6
–0.8
–0.6
Max
Unit
V
V
V
V
4. Number of outputs defined as “n”. Measured with “n–1” outputs switching from HIGH–to–LOW or LOW–to–HIGH. The remaining output is
measured in the LOW state.
CAPACITIVE CHARACTERISTICS
Symbol
C
IN
C
I/O
C
PD
Parameter
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
Condition
V
CC
= 3.3 V, V
I
= 0 V or V
CC
V
CC
= 3.3 V, V
I
= 0 V or V
CC
10 MHz, V
CC
= 3.3 V, V
I
= 0 V or V
CC
Typical
7.0
8.0
25
Unit
pF
pF
pF
http://onsemi.com
5
电源技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
